Patent GB-492687-A (GB)
Title: New and improved thermostatic regulating device
IPC: G05D23/12
Filed: 1937-03-25
Abstract: 492,687. Thermally-actuated valves. WILCOLATOR CO. March 25, 1937, No. 8813. Convention date, March 25, 1936. [Class 135] In a thermostatic regulating device for gas ovens, a rod 29 for adjusting the operative relation of an expansible chamber 6 filled with a thermo-responsive liquid to a regulating valve 22 passes coaxially through a hollow manually-operated stop cock 31 so as to form one wall of the fluid passage through the cock and is operable independently of the cock. As shown in Fig. 1, a valve casing 3 is secured by screws to an inlet nipple 33 previously threaded into the gas supply pipe 4. A bulb 1 also containing the thermoresponsive liquid is connected by a tube 2 to a chamber 7 closed by the bellows 6 which is expanded by a spring 13 abutting a disc 10. The head of the bellows is connected to a screwthreaded rod 14 a nut 15 on which has a shoulder 18 abutting a bi-metallic compensating lever 19 which opens the valve against the pressure of a spring 24. The valve outlet chamber 26 has two openings 27 one of which may be sealed by a plug (not shown). The nut 15 is adjusted by a square sleeve 17 on the rod 29, the latter being rotated by a handle 30. The rod 29 carries a dial 55 co-operable with a stationary pointer on the front panel 54. The dial is clamped between two washers 58, 59, one 58 being keyed to a threaded insert 56 in the knob 30 and the other 59 being keyed to the rod 29 and pressed outwardly by a spring 64. The cock 31 which is of conical form has a threaded extension 38 on which are clamped by nuts 40, a stop collar 48, a latching spring 43 and a disc 39. The cock 31 is rotated by a handle 37 carrying two arms 42 passing through notches 41 in the disc 39. The arms are carried on a ring 51 with four projections engageable in corresponding recesses in the handle so that the arms may be assembled in two alternative positions 90‹ apart and the '' off" position of the handle 37 made to conform to that of other taps on the range. The ends of the arms are forked to receive the ends of the spring 43 which is released from a fixed latch 44 when the handle 37 is pushed inwardly. The cock 31 may then be opened. Movement of cock is limited by a shoulder on the collar 48 engaging a corresponding shoulder on the valve casing. A spring 50 maintains the cock in its seat. Lubricant is applied to the cock by a passage 66 closed by a screw plug 67. In the form shown in Fig. 6, the cock 70 is tapered in the opposite direction and maintained against its seat by a spring 76, abutting a latch disc 78. A handle 92, located outwardly of the drum 98 which adjusts the rod 29, operates the cock by means of arms 87 engaging notches in a plate 89 keyed to the extension 90 of the cock. The inturned ends 95 of the arms lie in notches 80 in the plate 78 when the cock is closed but may be disengaged therefrom when the handle 92 is pressed inwardly against a spring 93. A conical collar 75 on the rod 29 is maintained in sealed engagement with a corresponding surface in the cock by a spring 107 abutting a nut 106. The drum 98 which is calibrated, is carried on a flanged sleeve 99 keyed to the rod 29 and is coupled to a collar 103 secured on the sleeve by a set screw 105. The latch plate 78 has ears 81 to retain a key plate 82. The latter has an aperture 85 with enlargements 86 whereby its edge may engage the ears 81 in the manner of a bayonet connection. The key plate has ears 84 which are bent round the latch plate and flats 83 which may be turned into alignment with the notches in the latch plate for removal of the arms 87. Specification 425,026 is referred to.